<template>
  <div class="top-category">
    <div class="container">
      <!-- 面包屑 -->
      <XtxBread>
        <XtxBreadItem to="/">首页</XtxBreadItem>
        <transition name="fade-right" mode="out-in">
          <!-- 因为动画只有在节点的创建隐藏时触发，这里不涉及节点的增删，所以加了key后由于vue的diff算法，key变了节点重新渲染 -->
          <XtxBreadItem :key="topCategory.id">{{ topCategory.name }}</XtxBreadItem>
        </transition>

      </XtxBread>
      <!-- 轮播图 -->
      <XtxCarousel :sliders="sliders" style="height:500px" />
      <!-- 所有二级分类 -->
      <div class="sub-list">
        <h3>全部分类</h3>
        <ul>
          <li v-for="i in topCategory.children" :key="i.id">
            <a href="javascript:;">
              <img :src="i.picture">
              <p>{{ i.name }}</p>
            </a>
          </li>
        </ul>
      </div>
      <!-- 分类关联商品 -->
      <div class="ref-goods" v-for="sub in subList" :key="sub.id">
        <div class="head">
          <h3>- {{ sub.name }} -</h3>
          <p class="tag">温暖柔软，品质之选</p>
          <XtxMore :path="`/category/sub/${sub.id}`" />
        </div>
        <div class="body">
          <good-item v-for="good in sub.goods" :key="good.id" :good="good" />
        </div>
      </div>
    </div>
  </div>
</template>

<script setup >
import { findBanner } from '@/api/home'
import GoodItem from './components/good-item.vue'
import { useRoute } from 'vue-router'
import { useStore } from 'vuex'
import { getTopCategory } from '@/api/category'

// 轮播
const sliders = ref([])
findBanner().then(data => {
  sliders.value = data.result
})
// 面包+分类数据 =>>>vuex 数据
const store = useStore()
const route = useRoute() // url中的查询参数
const topCategory = computed(() => {
  // 优化计算属性出现空情况
  let cate = {} // 相当于初始化了数据是个空对象，避免上面使用台多v-if
  const item = store.state.category.list.find(i => i.id === route.params.id)
  if (item) { // 如果查找到了再赋值
    cate = item
  }
  return cate
})
const getSubList = (nVal) => {
  getTopCategory(nVal).then(data => {
    subList.value = data.result.children
  })
}
// 获取子类目商品
const subList = ref([])
watch(() => route.params.id, (nVal) => {
  // 这里的前提
  // 1，id必须存在，2id必须是一级类目id
  if (nVal && `/category/${nVal}` === route.path) {
    getSubList(nVal)
  }
}, {
  immediate: true // 初始化发起一次
})

</script>

<style scoped lang='less'>
// 面包屑动画方式
// 进入：右侧 20px 的位移
// 离开反着来

.top-category {
  h3 {
    font-size: 28px;
    color: #666;
    font-weight: normal;
    text-align: center;
    line-height: 100px;
  }

  .sub-list {
    margin-top: 20px;
    background-color: #fff;

    ul {
      display: flex;
      padding: 0 32px;
      flex-wrap: wrap;

      li {
        width: 168px;
        height: 160px;

        a {
          text-align: center;
          display: block;
          font-size: 16px;

          img {
            width: 100px;
            height: 100px;
          }

          p {
            line-height: 40px;
          }

          &:hover {
            color: @xtxColor;
          }
        }
      }
    }
  }
}

.ref-goods {
  background-color: #fff;
  margin-top: 20px;
  position: relative;

  .head {
    .xtx-more {
      position: absolute;
      top: 20px;
      right: 20px;
    }

    .tag {
      text-align: center;
      color: #999;
      font-size: 20px;
      position: relative;
      top: -20px;
    }
  }

  .body {
    display: flex;
    justify-content: flex-start;
    flex-wrap: wrap;
    padding: 0 65px 30px;
  }
}
</style>
